Arthur langerfeld



Mrs STATES ARTHUR LANGERFELD, OF NE YORK, N. Y.

ART OF EMBOSSING SHEET METAL.

SPECIFICATION forming part of Letters Patent No. 426,132, dated April 22, 1890.

Application filed May 8, 1889. Serial No. 310,056" (No model.)

To all whmn it may concern:

Be it knownthat I, ARTHUR LANGERFELD, a citizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Embossing Sheet Metal; and I do hereby declare that the following isa full, clear, and exact description of the invention, which will enable others skilled in the art to which it pertains to make and use the same.

Ileretoforc sheet metal has been embossed in dies by means of hydraulic or fluid pressure supplied by a forcing -pump or by a drop or plunger. l-leat has also been used, to gether with fluid-pressure, by using steam from a high-pressure boiler; but the degree of heat required to soften most of the different kinds of sheet metalas, for instance, sheetbrass--is higher than that of steam or of any hot fluid which it is practicable to force from without onto or into a sheet-metal body inclosed in a die.

The object of my invention is to heat the sheet metal while in the die sufficiently to soften it and force it into the die while so heated, so that finer work can be produced than by the pressure of a hot fluid forced in from without.

To carr my invention into effect, I place the sheet metal onto or into a die which is provided with suitable means for inclosing and covering it, so as to form a tight chamber of which the walls, the top, or the bottom are lined by the plain sheet metal, which is placed against the engraved part of the die into which it is to be forced. One side or part of this chamber must be removable and fitted or connected to the edge or rim of the sheet metal, so that a tight connection is formed. One method of forming such a connection and chamber is illustrated in Patent No. 892,977, dated November 13,1888. Before closing the chamber so formed 1 place a suffieient quantity of slow-burning gunpowder or other similarly burning material or compound in a metal or earthen cup and put it into the chamber. I then close the chamber and light the compound by means of an electric wire or a fuse; or a compound may be used which will ignite sponta neously by pressure or after a certain lapse of time, which mu st be SUfllClGllt to enable the operator to close the chamben A certain pressure may be maintained upon the sheet metal by connecting the chamber with a forcingpump or other source of pressure, or the chamber may be closed entirely and the pressure generated within the chamber by the combustion allowed to act upon the sheet metal. In this case it is advisable to connect asafetyvalve with the chamber, so that in case the internal pressure should exceed the strength of the inclosurc it will not burst it, but blow off. The quantity or kind of compound to be burned in the chamber must be varied to give the desired result for each kind and thickness of the sheet metal to be embossed and must be determined by experiment. It must also be determined in the same manner whether to close the chamber entirely or use a forcing-pump or other source of pressure to supply a certain pressure in addition to the heat and pressure generated by the con1bustion of the material or compound burned in the chamber. Gases or liquids which will burn together as, for instance, air or oxygen and ordinary illuminating-gas or hydrogenmay also be used to supply the required heat. For this purpose pipes are inserted into the chamber and the ends of the pipes placed close together. The gases are forced into the chamber through these pipes. It is advisable to light these gases at the same time they are started or before they are inserted into the chamber, so that the chamber will not become filled by an explosive mixture of gases. A gas or other fluid may also be forced into the chamber and burned together with a material, a compound, or a flu id previously placed into the chamber-es, for instance, a cup of coal-oil placed into the chamber can be completely burned by lighting it and then forcing in sufiicieut air or oxygen to keep it burning.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The process or art of embossing sheet metal or sheet-metal bodies by placing them in or upon a die, then placing a suitable kind and quantity of slow-burning gunpowder or other suitable compound, material, or materials which will burn or burn together upon the sheet metal or in a vessel placed into the sheetqnetal body or upon the sheet metal,

then inclosing and covering the die and forming a tight connection between this cover and the edge or rim of the sheet metal, so as to form a tight chamber, then burning the gunpowder or other compound or material previously placed into this now tight chamber, and keeping the sheet metal subjected to the heat and pressure generated by this combustion or burninguntil fully impressed into the die, all substantially as described.

2. The process of embossing sheet metal or sheet-metal bodies by placing them in or upon a die, then placing a suitable kind and quantity of a compound, material, or materials which will burn or burn together upon the sheet metal or in a vessel placed into the sheet-metal body or upon the sheet metal, then inclosing and covering the die and forming a tight connection between this cover and the edge or rinrof the sheet metal, so as to form a tightchamber, then burning the compound or material previously placed into this now tight chamber, and then, while the sheet metal is heated by this burning, forcing air or some other suitable fluid into the tight chamber through an inlet in the cover until the internal pressure is sufficiently high to press the hot sheet metal into the die,all substantially as described.

3. The process of embossing sheet metal or sheetmetal bodies by placing them in or upon a die, then inclosin g and covering the die and forming a tight connection between this cover and the edge or rim of the sheet metal, so as to form a tight chamber, then forcing a suitable fluid or fluids into this chamber through an inlet or inlets in the cover, and burning this fluid or these fluids together as they enter the chamber, so that the sheet metal will be heated and while hot get pressed into the die by the internal fluid-pressure, substantially as described. I

at. The process of embossing sheet metal or sheet-metal bodies by placing them in orupon a die, then placing a suitable kind and quantity of a compound, material, or materials which will burn, together with a fluid, upon the sheet metal or in a vessel placed into the sheet-metal body or upon the sheet metal, then inclosing and covering the die and forming a tight connection between this cover and the edge or rim of the sheet metal, so as to form a tight chamber, then forcing a suitable fluid or fluids into this chamber through an inlet or inlets in the cover, which fluid or fluids will burn together with the compound, material, or materials previously placed into the now tight chamber, and causing this fluid to so burn and both heat and press the sheet metal into the die, all substantially as described.

ARTHUR LANGE RFELD.

Witnesses:

ROBERT McGILL, M. D. LANGERFELD. 

